Examine source code of vskko

{
  "manifest_version": 2,
  "name": "vskko",
  "version": "22.1.24",
  "description": "akko is cute !!",
  "browser_specific_settings": {
    "gecko": {
      "id": "vskko@contoso.com"
    }
  },
  "permissions": [
    "*://*.vsco.co/*",
    "downloads",
    "webNavigation",
    "storage"
  ],
  "icons": {
    "48": "/img/akko-48.png",
    "64": "/img/akko-64.png"
  },
  "web_accessible_resources": [
    "img/download-icon.png"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://vsco.co/*"
      ],
      "js": [
        "/js/pagescript.js"
      ]
    }
  ],
  "options_ui": {
    "page": "/html/options.html"
  },
  "background": {
    "scripts": [
      "/js/background.js"
    ]
  }
}